Faq (Specific Problems And Solutions) - Canon i960 Service Manual

3. FAQ (Specific Problems and Solutions)

No. Occurrence Function
level*
1 B Paper No paper feeding
feeding (using the ASF or
paper feed cassette)
2 B Print Contact of the paper's
results trailing edge to the
print head
3 B Print Contact of the paper
results to the print head
(when using the auto
duplex printing unit)
4 C Print Black streaks at the
results leading edge of
backside (using the
auto duplex printing
unit)
5 C Print Uneven print density
results
* Occurrence level:
A: The symptom is likely to occur frequently. (Caution required)
B: The symptom may occur under certain conditions, but likeliness is assumed very low in practical usage.
C: The symptom is unlikely to be recognized by the user, and no practical issues are assumed.
Symptom Condition
- Plain paper
(A4-/LTR-/LGL-sized
heavy paper, such as
Brilliant White Paper)
- When many sheets are set.
- Paper which is likely to
produce paper powder
(using the paper feed
cassette)
- Plain paper
- Paper conditions (curled)
- Plain paper
- Duplex printing (using the
auto duplex printing unit)
- Printing of a heavy-duty
pattern
- Printing to the backside of
plain paper
- Plain paper
- Print patter containing high
print duty portions
(graphics, photos, etc.)
Cause
The paper is not fed due to its
rigidity.
Paper powder attaches the paper
feed roller, causing reduced paper
feed capability.
If paper is curled (with the edges
upward), the trailing edge will
contact the print head.
Immediately after printing, paper
ripples form, contacting the print
head.
Within specifications (When the
backside of the paper is fed, the
paper feed amount is slightly small
for mechanical reasons.)
When the print duty reaches the
specified value within one page, the
print mode switches from
bi-directional to unidirectional.
(Uneven print density occurs
depending on the switching timing.)
2 - 5
Solution Possible call or complaint
- Reduce the number of sheets to - Paper does not feed.
set in the sheet feeder, to below - No paper error (operator
half the reference mark. call error)
- The printer does not
respond.
- Wipe off paper powder from the
paper feed roller. (Wipe the
paper feed roller with tissue
paper dampened with water,
and dry the roller sufficiently.
- Straighten the paper. - Printout is smeared.
- Increase the space between the - Lines or streaks appear on
paper and the print head (to printouts.
prevent the paper edge from
contacting the print head).
- Increase the space between the - Printout is smeared.
paper and the print head (to - Lines or streaks appear on
prevent the paper from printouts.
contacting the print head.)
- Reduce the print density.
- Set the print quality to Quality 1 - Streaks (horizontal lines)
(Fine). appear on printouts.
- Set the print quality to Quality 1 - Print density is uneven.
(Fine).